talk to the doctor about getting blood levels done in a few weeks. It's worse as your liver gets up to speed, then settles out once your blood levels get back to 'normal'. But, if it comes back again, talk to them.
Regarding the eyes, shakes, etc, I found coca-cola good, lying down good, and generally trying to sleep though it. Don't drink alcohol, or grapefruit juice, as this will make it worse a couple of days later because of interactions.
Also, take it with a meal, and just before bed (so the worst of the side-effects are when you're asleep). If it doesn't improve, there is a slow release version.
I'm not a medical person, but I've been on it 15 years for epilepsy. What I personally do if the side effects happen is take a tiny bit less for one dose, to reduce the side-effects, then go back to the normal dose. If it's really bothering you, talk to the GP about if you could do the same - and get him to suggest the exact amounts to do it. I also take slightly more before bedtime and less during the day. But talk to your GP about any changes if you want to make them.
Hope some of that helps.....